HEX KEY (ALLEN KEY) AND HEX BIT SOCKET SIZES
Allen Key (Hex Key) and Hex Bit Sizes Calculator was developed to show dimensions of Allen keys (Hex keys) and bit sockets according to ASME B18.3-2003 standard.
Hexagonal (Hex) keys (Allen Keys) and bits sockets are tools which are used to drive screws with a hexagonal socket. Hexagon Keys are furnished as Short Arm Series or Long Arm Series.
Some important notes from the ASME B18.3:
– Hexagon keys and bits shall be fabricated from an alloy steel having two or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium, in sufficient quantity to ensure that the specified minimum hardness of 48 HRC at the surface for nominal sizes up to and including 3⁄8 in., and 45 HRC for nominal sizes over 3⁄8 in., is met when hexagon keys and bits are hardened by quenching from the austenitizing temperature and tempered.
 |
|||
| RESULTS | |||
| Parameter | Symbol | Value | Unit |
| Nominal Key Size (Frac.) | — | — | — |
| Nominal Key Size (Dec.) | — | in | |
| Hexagon Width Across Flats [W] |
Wmax | — | |
| Wmin | — | ||
| Hexagon Width Across Corners [Y] |
Ymax | — | |
| Ymin | — | ||
| Length [B] | Bmax | — | |
| Bmin | — | ||
| Length [C] (Short Series) | Cmax | — | |
| Cmin | — | ||
| Length [C] (Long Series) | Cmax | — | |
| Cmin | — | ||
| Minimum Bend Radius | Rmin | — | |
| Bit Length 2,3 | L | — | |
| Maximum Chamfer | Kmax | — | |
